The Seiko 4N21-058A is a watch model based on the 4N21 movement.
Parts List
| 185W39SN02 | crystal - crystal |
| 6K30A1SNG0 | crown |
| 0F175BAA5 | case back gasket - case back gasket |
| 0F170BAA1 | case back gasket |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 86561071 | crystal gasket |
| DA78BW | band - band |
| DA68DW | band - band |
| DA78BW-BJ00 | clasp - buckle |
| 3BA075F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| 4N211130XS19 | others - dial |
| 4N211940XS14 | others - dial |
| 4N2164 | others - machine code |
| 1BD050A0BAA | others - hour hand |
| 0351155 | others - winding stem |
| 82832995 | others - case ring |
| 4N210580 | others - case back |
| 4N21058A75 | others - case |
| 82280531 | others - bezel |
| 4N21058A75B | others - case |
| 4N21058A | others - case back |
| 07T33AGH | others - hour hand |
| 07T31DGH | others - hour hand |
| 07T31DGM | others - minute hand |
| 07T33AGM | others - minute hand |
| 1BD050LDBDG | others - hour hand |
| 2BD072LABDG | others - minute hand |
| 2BD075A0BAA | others - minute hand |